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The JMI Telescopes SCT Threaded Output Adapter-2" is made to allow telescopes with 2" focuser barrels to accept accessories made to mate with a Schmidt-Cassegrain scope's 2"-18 (2" diameter, 18 threads per inch) threading.
The "input" end (where the light would enter this adapter) is a 2" outer diameter unthreaded barrel, and the "output" end (where light exits this adapter) is a 2" barrel with 18 male threads per inch.
In the Box
JMI Telescopes SCT Threaded Output Adapter for 2" Drawtubes